Rotary bit



Aug. 26, 1930.

J. A. COONEY ROTARY BIT Filed April 29, 1929 INVENTOR BY J00 flCoaney I ATTORNEY d il 1 5 which. a e; illustrated in the accompanying 5P ff f,...'1lhe upper. conical surface ScOnvergesvvith the-stem 3, and

Patented Aug. 26, 1930 igjlufii ranSTATES PATENT 'firon'nnuooonmr, orTULsA, OKLAHOMA, hssrenoiz' or ONE-FOURTH TO HARRY'F. I K QQ INLAN; OF TULSA, OKLAHOMA s r ROTARY BIT My; invention tents to de ining bitsand tenance of-ibits of thisftype,"by providing re v movable 'c'ntters'in thefbody'portion of the "tool, so that the cutters may be'removed for sharpening temperingend for replacement .10 h'ylcutters of difi'er'ent materials'to s'uit the nature of the formations being drilled." j .accornplishin' these and other 'objeets of the invention 1' have provided improved f; structure, the preferredfforms "of L dravvings jvvherein; V v V .1 I

r v .F igfi lt. is ,afperspective View ofrny improved .Fig; .2 -'s'.. a, central section gohthroughtheibit.

i -'Fig. 3 is a detail perspective viewqofthe 'headuof the bitstemi q J'Figggyis transverse section on 'the'iline 4 ,'Fig. i

2 Referring indetailtolthe drawings I 1 designates the, assembled driHingjbitl in fclndingfaj core. member 2 comprising a stem 3 "With neonical shaped head 5 at itsflowerend and longitndinallyy through the stem and "head/wprtionif i 'lhe headportion 5ofjthecore member includes oppositely tapered-conical meme portions'9, and '11 of eqnal idth 7 and in set fromeach other to form shoulders 12 and .13; the lower p'ortionloeing providedj withai b ttoms rfes 1 e insir d l v l ver 'from'the' stem 3 are a 1plura'lity of equally merits .516.

- ns l he inge l ssens fe f i l i nd are recesses 29-extending radieilyontward transverse slots 31'. gaged by, the retainer 'ri1'1g'25.

n {opening- 6 extending centrally tending downwardly at flvarying. angles i Assembled on t he;ste1n,3 above 'is-asleeve 36' havin jan m ed'jb e g t y larger in. diameter than the he d 1929.. seria No. 359,023; 5

extending o g e f l s a d] Get-15am 1 through the annular portion -9 of the surface 7," The openings 19 are located centrally between the slits and extend downward at a greater angle of inclination than the open lngs 17 and open through the shoulder 13.

' Mounted in the openings 17, '18 and 19 are cutters 20' comprising. cylindrical bodies '21 projecting "from the-head 5 and having j tapered outer'ends22 i or ning cutting edges V 23, and hav ng transverse slots 24 ett their 1 opposite ends for engagement by a"retainer" r1ng'25.

The "reteiner ringi25 extends around conical surfaoe 8 and is anchored to the head 5 by an'anchor'studfldand by an'inturned 1 end 27 of'the ring engagingan apertureZB from points] in' diametrical alignment 1 with jthe npper ends ogt the'openings 17 l8jand' 1 19. Mounted inthe'rece'sses '29 are'cutters 30 similar to 'thecutters 20, and having .1 a t eir pp r e en Loeated at'the r pper; end of the-slits 15 A i'n-lthe head 5 are a plurality of openings .32.

equi'allyspaced aronnd the stem 3 and eX- thronghfthe flat botto n surface 1 1;

, Mount djin. the openingsv 32 are cutters 33 similar toth'e cuttersQO except forv length,

lower endsof the' cntters projectingangularly from the bottom face 1% of thehead',

and the upper. ends} thereof having transverse slots 3t engagedhya, retainer ring35 v Which encircles the ste n 3. I 1 the headG 5,.2tnd central opening 38 snuglyfengaging the stem and provided with ataperedcounterbore 39 fittingthesurface 8io f the head.

29 in the head "5 for receiving the; person of so I the cutters protruding from the upper conicalsurface 8. v

The upper end of the sleeve 36 is'provided with an enlarged portion 41 having a tapered end surface 42 and a ring portion 43 pro jecting upwardly from the upper end of the tapered surface for engagement by a retainer tion .49 equal in diameter to the enlarged portion 37 of the sleeve 36 andprovided at its upper end "with arreduced neck 50. An opening 51 extending centrally through the coller is. provided withtapered counterbores 52 and 53 at its opposite ends and the lower portion of the opening isjengagedby the ring -p0rtion 43 on the sleeve member.

7 A threaded opening 54 is provided in the .side Wall of the collar. and fitted with a set screw 55 engageable with the stem 3 for retaining the sleeve member on the stem during the assemblyof the device.

Becesses 56 are provided in the tapered surface of the counterbore i 52" and register with the grooves 45 in the sleeve for receivingthe protruding portions of the cutters 46."

Mounted onthe stem 3 above the collar -44 isa coupling member 57 having a threaded opening 58 engaging the threaded portion I 4 of'the stem and provided with a-tapered lower end 59 fitting the counter bore 53 and adapted for urging the h'ead 5, sleeve 36 and collar 46 into assembled relation. f

Formed at the upperend of the coupling member57 is a shank :60 provided witha cen- "tral opening 61 "communicating with the o ening .in the stem i3,"'and formed onthe "s ank are threads 62 for attachment'to drill pipe 63 whereby 'theibit" is 'operably con nec't'ed with actuatingmeans when in oper- 1 ation".

When thedevice is assembled the cutters are secured by the retainer rings 25,35 and 1 48, and by the clamp g action of thesleeve 7 engaged from the stem to the collar 44cand sleeve 36.

' 36 and retainer collarf l. s, I When it becomesnecessary to remove the fcutters for sharpening, tempering or replace- 1 ment, the coupling member 57 is removed from the stem 3, and the set screw 55 is dis- With the sleeve removed from engagement with the head and. the collar 44 removed fromfeng'agementwithlthe sleeve. 36, the re- ,tainer rings and headportionsof thecutters are exposed so that the cuttersmay be removed and replaced asdesired. i

permit removal of the sleeve engaging said reaming cutters, a

collar member on the stem engaging said reaming cutters, and a coupling member on the threaded portion of the stem, having a through channel communicating with the opening in the stem. 7 1

2. A drill bit including a stem having a through channel, a conical-shaped head at one end of the stem having radially'disposed openings, a threaded portion at the opposite end of the stem, cutter members in the head openings having portions protruding from said head and provided with transverse slots, 'a retainer ring on the head engaged in said slots, a sleeve member on the stem engaging the head and the protruding portions of said cutters, said sleeve having radially disposed grooves at'its upper end, reaming cutters in said grooves having portions protruding from the sleeve and provided with transverse slots, aretamer rlng on thesleeve engaged in said slots, and a coupling member" on the threaded portion of the sleeve engaging the protruding portions of said reaming cutters, having a through opening communicating with the channel in said stem.

;3. In a drill bit, a stem including a conical head having openings extending'through its sideand top faces, cutter members removably located in said openings with their ends extended from the side and top faces of the head, aretaining'ring engaging the upper ends of the cutter members, and a sleeve on the stem, engaging the head and recessed'to' seat the upper ends of the cutter members.

4. In a drill bit, a stem including a conical head having a bevelled top face and having openings extended-through its side and top faces, cutter members in said openings havving cutting ends extended from the side face' and grooved ends extending from the top face, a mug seated in the grooves in the upper ends of the cutter members, a sleeve on. the

stem seated on the upper iiace of said head and recessed to seat the upper ends'of the cutter members, and means for retaining the sleeve I onthe stem.- 7 V 5. In a drill bit, a stemincluding a conical headdivided longitudinally and having matmg grooves in the side faces of its segments extending through the side and top faces of the head tofo'rmopenings, and havin'g'radial groovesin the upper faces of itssegments', cutter members in said openings projecting from said side and top faces, cutter'members in said grooves having cutting ends rojecting from the side of the head, a retainlng ring engaging the upper ends of said cutter mem- I hers, asleeve in the stem recessed to seat the projecting upper ends of the first named cutter members, and having radial grooves operating with the radial grooves in the head to seat the second-named cutter members, and means for retaining the sleeve on the stem. In testimony whereof I aifix my signature.

JOHN A. COONEYL 

